Re: [PATCH 04/12] ARM: provide arm_has_idmap_alias() helper
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- To: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH 04/12] ARM: provide arm_has_idmap_alias() helper
- From: Pratyush Anand <panand@xxxxxxxxxx>
- Date: Fri, 29 Apr 2016 19:51:42 +0530
- Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, devicetree@xxxxxxxxxxxxxxx, Tony Luck <tony.luck@xxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, Pawel Moll <pawel.moll@xxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Haren Myneni <hbabu@xxxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Santosh Shilimkar <ssantosh@xxxxxxxxxx>, Kumar Gala <galak@xxxxxxxxxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>
- In-reply-to: <E1aviEu-0000ix-C1@rmk-PC.arm.linux.org.uk>
- List-id: <linux-ia64.vger.kernel.org>
- References: <20160428092644.GX19428@n2100.arm.linux.org.uk> <E1aviEu-0000ix-C1@rmk-PC.arm.linux.org.uk>
On Thu, Apr 28, 2016 at 2:58 PM, Russell King
<rmk+kernel@xxxxxxxxxxxxxxxx> wrote:
> Provide a helper to indicate whether we need to perform special handling
> for boot identity mapping aliases or not.
>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> ---
> arch/arm/include/asm/memory.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index ca208335fde6..31c07a2cc100 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset;
> * of physical memory for idmap purposes. Most cases should leave these
> * untouched. Note: this can only return addresses less than 4GiB.
> */
> +static inline bool arm_has_idmap_alias(void)
> +{
> + return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
> +}
> +
> #define IDMAP_INVALID_ADDR ((u32)~0)
>
> static inline unsigned long phys_to_idmap(phys_addr_t addr)
Reviewed-by: Pratyush Anand <panand@xxxxxxxxxx>
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